汽车EPS预测控制仿真研究

Simulation of Predictive Control of Vehicle Electric Power Steering System

针对汽车EPS系统的非线性实时变化问题,设计了一种EPS的广义预测控制(GPC)算法。通过模糊算法,设计了EPS的助力特性曲线。建立了助力电机电流和转向杆位移的预测控制模型,实现对EPS的预测控制。基于dSPACE的ASM模型,在Matlab/Simulink中建立了GPC的仿真模型,进行了EPS的转向轻便性实验。结果表明,GPC能够较好地满足EPS的要求,在低速时,具有较好的轻便性,在高速时,可以提供较强的路感。

In order to solve the nonlinear real-time change problem of vehicle EPS, a generalized predictive control （GPC） algorithm is designed for the vehicle electric power steering system （EPS）. The assistance characteristic curve of EPS is designed by using the fuzzy algorithm. A couple of predictive control models about the current of assistance motor and the displacement of steering rod are established. A GPC controller is designed to control the EPS system. The GPC is modeled in Matlab/Simulink, and the steering efforts are tested base on the ASM model of dSPACE platform. The result shows that the GPC can meet the demand of EPS control system perfectly. The vehicle EPS with the GPC can make the vehicle have a good steering maneuverability in a low speed and a strong road feeling in a high one.